However, assuming you are referring to Shin Sekai no Ko to Otomari (The Girl in the New Century) or a similar title, here is some information.
: It is highly recommended by MAL users who are looking for a break from generic "isekai" or "overpowered MC" tropes, with some calling it a "masterpiece" of its season. Shinseki No Ko To O Tomari Dakara Studios : dry-goods shinseki no ko to o tomari da kara mal